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Old 01-18-2017, 01:51 AM   #19
SirDigby
 
Drives: 2007 yaris 3 door
Join Date: Sep 2015
Location: Denver, Colorado
Posts: 949
this engine is not producing enough pressure to require anything larger than 2" diameter exhaust. i had a civic (130hp) with a 2.25 and shrunk it down to 2" and had noticeable gains.
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Old 02-21-2017, 07:21 PM   #20
man83
 
Drives: Yaris HB
Join Date: Dec 2014
Location: GT (502)
Posts: 70
Quote:
Originally Posted by NJP440 View Post
I was referred to go magnaflow I'm trying to keep an even 2.5" the full way back but I definitely need something a little quieter before I get pulled over

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Sorry, the muffler is Magnaflow 14805, double wall, 3.5" Tip Dia, 3.75 Tip Lenght, 2.25 Inlet Dia.


Quote:
Originally Posted by tarkus View Post
Keep in mind that you can lose some low-end torque if you go too wide with the exhaust diameter.


I vote for the underdrive pulley. It will also be lighter weight :-)


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Some place to buy it online?


Quote:
Originally Posted by tmontague View Post
If you're keeping your engine NA then don't go larger than 2.25".

I decided to take the advice of a reputable and very good exhaust shop against the advice of some of the experienced YW members and I lost noticable torque. Had the shop re make a 2.25" and most of the torque came back and still has the increased top end.

That was with all the flow mods -dc header, MI intake manifold, intake, 1zz TB.
Good to know it.
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